package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经登录
 */

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}",request.getRequestURI());
        //chain.doFilter(request,response);

        //1.获取本次请求的URL
        String requestURI = request.getRequestURI();
        //2.定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",    //移动端发送短信
                "/user/login"   //移动端登录
        };
        //3.判断本次请求是否需要处理
        boolean check = check(urls,requestURI);
        //4.如果不需要处理，则放行
        if (check){
            log.info("请求不需要处理：{}",request.getRequestURI());
            chain.doFilter(request,response);
            return;
        }
        //5-1.判断登录状态，如果已经登录，直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录");

            //将用户id设置到线程域中
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            chain.doFilter(request,response);
            return;
        }
        //5-2.判断登录状态，如果已经登录，直接放行--------------移动端
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录");

            //将用户id设置到线程域中
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            chain.doFilter(request,response);
            return;
        }
        //如果未登录，则返回未登录结果
        /**
         * 这里不是直接跳转回登录页面，因为前端代码有一个拦截器，拦截后端响应的数据，前端会跳转页面，这里应该根据要求来写
         */
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放心
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for(String url : urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }

}
